How to use the parso.python.tree.PythonNode function in parso

decoratee_context = ClassContext(
            context.evaluator,
            parent_context=context,
            tree_node=node
        )
    else:
        decoratee_context = FunctionContext.from_context(context, node)
    initial = values = ContextSet([decoratee_context])
    for dec in reversed(node.get_decorators()):
        debug.dbg('decorator: %s %s', dec, values, color="MAGENTA")
        with debug.increase_indent_cm():
            dec_values = context.eval_node(dec.children[1])
            trailer_nodes = dec.children[2:-1]
            if trailer_nodes:
                # Create a trailer and evaluate it.
                trailer = tree.PythonNode('trailer', trailer_nodes)
                trailer.parent = dec
                dec_values = eval_trailer(context, dec_values, trailer)

            if not len(dec_values):
                code = dec.get_code(include_prefix=False)
                # For the short future, we don't want to hear about the runtime
                # decorator in typing that was intentionally omitted. This is not
                # "correct", but helps with debugging.
                if code != '@runtime\n':
                    debug.warning('decorator not found: %s on %s', dec, node)
                return initial

            values = dec_values.execute(arguments.ValuesArguments([values]))
            if not len(values):
                debug.warning('not possible to resolve wrappers found %s', node)
                return initial

if node.type == 'classdef':
        decoratee_context = ClassContext(
            context.evaluator,
            parent_context=context,
            tree_node=node
        )
    else:
        decoratee_context = FunctionContext.from_context(context, node)
    initial = values = ContextSet(decoratee_context)
    for dec in reversed(node.get_decorators()):
        debug.dbg('decorator: %s %s', dec, values)
        dec_values = context.eval_node(dec.children[1])
        trailer_nodes = dec.children[2:-1]
        if trailer_nodes:
            # Create a trailer and evaluate it.
            trailer = tree.PythonNode('trailer', trailer_nodes)
            trailer.parent = dec
            dec_values = eval_trailer(context, dec_values, trailer)

        if not len(dec_values):
            debug.warning('decorator not found: %s on %s', dec, node)
            return initial

        values = dec_values.execute(arguments.ValuesArguments([values]))
        if not len(values):
            debug.warning('not possible to resolve wrappers found %s', node)
            return initial

        debug.dbg('decorator end %s', values)
    return values

def __check_if_node_is_valid(node):
    valid = True
    if isinstance(node, tree_nodes.PythonNode):
        kind = node.type
        valid = kind not in {'decorated', 'parameters', 'dictorsetmaker',
                             'testlist_comp'}
        if kind == 'suite':
            if isinstance(node.parent, tree_nodes.Function):
                valid = False
    return valid

decoratee_context = ClassContext(
            context.evaluator,
            parent_context=context,
            tree_node=node
        )
    else:
        decoratee_context = FunctionContext.from_context(context, node)
    initial = values = ContextSet([decoratee_context])
    for dec in reversed(node.get_decorators()):
        debug.dbg('decorator: %s %s', dec, values, color="MAGENTA")
        with debug.increase_indent_cm():
            dec_values = context.eval_node(dec.children[1])
            trailer_nodes = dec.children[2:-1]
            if trailer_nodes:
                # Create a trailer and evaluate it.
                trailer = tree.PythonNode('trailer', trailer_nodes)
                trailer.parent = dec
                dec_values = eval_trailer(context, dec_values, trailer)

            if not len(dec_values):
                code = dec.get_code(include_prefix=False)
                # For the short future, we don't want to hear about the runtime
                # decorator in typing that was intentionally omitted. This is not
                # "correct", but helps with debugging.
                if code != '@runtime\n':
                    debug.warning('decorator not found: %s on %s', dec, node)
                return initial

            values = dec_values.execute(arguments.ValuesArguments([values]))
            if not len(values):
                debug.warning('not possible to resolve wrappers found %s', node)
                return initial

decoratee_value = ClassValue(
            context.inference_state,
            parent_context=context,
            tree_node=node
        )
    else:
        decoratee_value = FunctionValue.from_context(context, node)
    initial = values = ValueSet([decoratee_value])
    for dec in reversed(node.get_decorators()):
        debug.dbg('decorator: %s %s', dec, values, color="MAGENTA")
        with debug.increase_indent_cm():
            dec_values = context.infer_node(dec.children[1])
            trailer_nodes = dec.children[2:-1]
            if trailer_nodes:
                # Create a trailer and infer it.
                trailer = tree.PythonNode('trailer', trailer_nodes)
                trailer.parent = dec
                dec_values = infer_trailer(context, dec_values, trailer)

            if not len(dec_values):
                code = dec.get_code(include_prefix=False)
                # For the short future, we don't want to hear about the runtime
                # decorator in typing that was intentionally omitted. This is not
                # "correct", but helps with debugging.
                if code != '@runtime\n':
                    debug.warning('decorator not found: %s on %s', dec, node)
                return initial

            values = dec_values.execute(arguments.ValuesArguments([values]))
            if not len(values):
                debug.warning('not possible to resolve wrappers found %s', node)
                return initial

classdef=node
        )
    else:
        decoratee_context = FunctionContext(
            context.evaluator,
            parent_context=context,
            funcdef=node
        )
    initial = values = ContextSet(decoratee_context)
    for dec in reversed(node.get_decorators()):
        debug.dbg('decorator: %s %s', dec, values)
        dec_values = context.eval_node(dec.children[1])
        trailer_nodes = dec.children[2:-1]
        if trailer_nodes:
            # Create a trailer and evaluate it.
            trailer = tree.PythonNode('trailer', trailer_nodes)
            trailer.parent = dec
            dec_values = eval_trailer(context, dec_values, trailer)

        if not len(dec_values):
            debug.warning('decorator not found: %s on %s', dec, node)
            return initial

        values = dec_values.execute(arguments.ValuesArguments([values]))
        if not len(values):
            debug.warning('not possible to resolve wrappers found %s', node)
            return initial

        debug.dbg('decorator end %s', values)
    return values

def _get_faked(grammar, module, obj, name=None):
    result, fake_module = _faked(grammar, module, obj, name)
    if result is None:
        # We're not interested in classes. What we want is functions.
        raise FakeDoesNotExist
    elif result.type == 'classdef':
        return result, fake_module
    else:
        # Set the docstr which was previously not set (faked modules don't
        # contain it).
        assert result.type == 'funcdef'
        doc = '"""%s"""' % obj.__doc__  # TODO need escapes.
        suite = result.children[-1]
        string = tree.String(doc, (0, 0), '')
        new_line = tree.Newline('\n', (0, 0))
        docstr_node = tree.PythonNode('simple_stmt', [string, new_line])
        suite.children.insert(1, docstr_node)
        return result, fake_module